No... not that I'm aware of.
QPI isn't the only problem though, high BCLK takes a toll on the CPU and expecially VTT requirement, that's why I prefer the 23x mult to the 21x.
High toll on the cpu - I don't know.
I am able to run 211 bclock all day with qpi at 1.335v (near intel max)
I thought that if I had a lower qpi multi - say 34, 32, ... I could push bclock higher.
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